Grill brush attachment having spiral bristles



FIG. 1 is a rear isometric view of a grill brush attachment having spiral bristles in accordance with the new design;

FIG. 2 is a front view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a side view thereof.

The broken lines shown on the side of the grill brush attachment in FIGS. 1 and 6 and the horizontal broken lines shown on the attachment in FIG. 3 represent the bounds of the claim and all of the other broken lines are understood to illustrate the environment in which the article embodying the design is used. None of the broken lines form part of the claimed design. 

The ornamental design for a grill brush attachment having spiral bristles, as shown and described. 